cmc11 test 1 ballistics

Question 1

obturation

Answer 1

when the case expands from the heat and pressure, forming a gas-tight seal in the chamber

Question 2

optimal amout of twist for 5.56

Answer 2

one rotation in 6-9 inches

Question 3

precession

Answer 3

a circular motion of the bullet’s center of gravity aligning with the projectile’s center of mass as the bullet is rotated and stabilized

Question 4

magus moment

Answer 4

the initial period in a bullet’s flight when it is not stabilized